My buddy Madge is right...if there is 1 Premier guy in the country that sails single it's Ted Jagger. I was there at the Pan-Am qualifier and Teddy was golden...it was just a hot day and body water can make up several pounds...just think of wrestling.
Here's the thing, if you can get to 285 with 50 lbs...maybe just try and add another 5 lbs through Mcydees the week before..then you won't have much to worry about water loss.
I've been beat and been lucky to beat Teddy while he is singlehanding it. I think he gets at a disadvantage with bigger wind, but in the light stuff it's a GREAT way to sail if you qualify. Good luck and I hope we can race against each other some day!
Take care and keep up the Big Macs! Ha!